I prefer the option with that results in the least boards, because we already have a LOT of boards. I'm also of the opinion that having all of the suggestions available in a single board means that opportunity glances might result in a dev who wouldn't ordinarily have looked at a suggestion saying "Hrm, that might actually be neat, can I make it happen?"
Boards are a lot more complicated than tags, and I don't believe automated tagging is particularly necessary. Anything that's going to get a mod tag should be getting the at least 5 minutes of attention it deserves anyways, and what does another 30 seconds of clicking really mean in that case?
To clarify: Users will be REQUIRED to choose a tag when posting. It will be against the rules to choose an invalid tag. This is the level of automated tagging I am proposing.
Edit:
Another particular advantage is that if a dev wants us to formally add a specific tag type, e.g. [Clan] or [ToriShop], we can do so. We can do so in 5 minutes with essentially no chance of fucking up permissions, of moving threads to the wrong place, or of making the system in any way more complicated or easier to break in the future.
irc
<shev> I feel like there is a gap between elevated and implemented
<shev> but at the same time people expect everything that's "in development" to be eventually implemented
<suomynona> yeah
<suomynona> and sometimes that's just not the best option for everyone
<shev> let's keep it general for now and see how this version of S&I works